#include "stdio.h"
#include "stdlib.h"

char* getcharBuffer()
{
    return "6969,3p3p";
}

void changeto4p(char * buffer)
{
    while (*buffer)
    {
        if (*buffer == '3')
        {
            *buffer = '4';
        }
        buffer++;
    }
}

int main(int argc, char* argv[])
{
    printf("%s\n", "Any key continue...");
    getchar();
    char *str = getcharBuffer();
    changeto4p(str);
    printf("%s", str);
    return 0;
}
